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METHOD AND APPARATUS FOR MONITORING AND CORRELATING VISIBLE ENVIRONMENTAL CONTAMINATION

  • US 3,841,763 A
  • Filed: 06/25/1973
  • Issued: 10/15/1974
  • Est. Priority Date: 06/25/1973
  • Status: Expired due to Term
First Claim
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1. Photographic photometry apparatus for pictorial recording of scene brightness comprising, in combination:

  • a photographic camera means adapted to photograph a scene simultaneously with photographing a light opacity reference means, and recording said photograph on a recording medium;

    an enclosed light-shield box supported about the lens opening of the camera means, said box providing a substantially nonreflective interior enclosure and supporting a scene light filter assembly about the front of the lens opening and intersecting the field of view of the camera means, said scene light filter assembly including a neutral density light filter in line with the camera means optics and adapted to be aligned with a subject to be recorded;

    a light reflection plate means positioned about the exterior of the light-shield box adjacent to said light filter assembly, the light reflection means being positioned with the surface of the light reflection means intersecting a portion of the field of view of the camera means and in facing alignment with an illuminance source to diffusely reflect illuminance rays from the source to within the enclosed light-shield box; and

    a light opacity reference means of a plurality of neutral density mediums of varying degrees of light absorption, the light opacity reference means being positioned to intersect the field of view of the camera means and in alignment with the illuminance rays of the illuminance source reflected to the camera means optics through the enclosed light-shield box.

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